I'm pretty sure, given the backlash Mirko saw when this originally got out, he knows signing with Dream under the table would really hurt his fanbase. That said, Mirko has a good point when he says he wants to fight more then twice a year. Really, that is a huge problem with the UFC that you have to build up such a massive roster of fighters because most are locked down on a shelf for 4-6 months at a time, waiting.